A 2004 Lexus Is300 Transponder Chip Key must be cut and programmed before it will work for your vehicle. Cutting and programming can be performed at a local automotive locksmith or dealership. There are no onboard programming instructions available for the 2004 Lexus Is300 chip key. Only a professional with special tools can make it work for your vehicle.If you are unable to find anyone to cut the key for you, we offer a key cutting service for $29.95. Please visit this link Key cut service for more information. Please note: the cutting service does not include programming. You still need to visit a local automotive locksmith or dealership for programming.